Assuming that all conditions are met to approximate a binomial probability distribution with the standard normal distribution, then to compute
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from the binomial distribution we must compute
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as the normal approximation.
◦ P(x > 12.5) and P(x < 14.5)
◦ P(11.5 < x < 15.5)
◦ P(x > 15.5) and P(x < 11.5)
◦ P(12.5 < x < 14.5)